#include<stdio.h>
#include<math.h>
int IsPrimer(int x)
{
    int flag = 0;
    int q = int(sqrt(x));
    for(int i = 2; i <= q;i++)
    {
        if(x % i == 0) flag = 1;
    }
    if(flag == 0) 
    {
        return 1;
    }
    else
    {
        return 0;
    }
}
int main()
{
    //freopen("in.txt","r",stdin);
    long long k[3];
    scanf("%lld %lld %lld",&k[0],&k[1],&k[2]);
    for(int i=0; i < 2;i++)
    {
        if(k[i] > k[i+1])
        {
            long long temp = k[i+1];
             k[i+1] = k[i];
            k[i] = temp;
        }
    }
    if(k[0] + k[1] <= k[2])
    {
        printf("Not triangle");
    }
    else
    {
        if((k[0]*k[0] + k[1]*k[1]) == k[2]*k[2])
        {
            printf("Right triangle\n");
        }
        if(k[0]*k[0] + k[1]*k[1] > k[2]*k[2])
        {
            printf("Acute triangle\n");
        }
        if(k[0]*k[0] + k[1]*k[1] < k[2]*k[2])
        {
            printf("Obtuse triangle\n");
        }
        if(k[0] == k[1])
        {
            printf("Isosceles triangle\n");
        }
        if(k[0] == k[1] && k[1] == k[2])
        {
            printf("Equilateral triangle\n");
        }
    }
}